The modeling and simulation community has developed many processes for certifying the creditability of simulation models. Many of these processes are implemented throughout the model development cycle and require comparison of the developed model with the system being simulated. With the increased focus on model reuse, these processes need to be tailored to address the development cycle of reusing existing creditable models. This paper outlines the validation process that certifies the creditability of simulation models produced by the MRMAide (Mixed Resolution Modeling Aide). MRMAide is a technology that semi-automates the development of model wrappers. These wrappers are used to resolve fidelity differences between models using mixed resolution modeling (MRM) techniques that allow for the reuse of existing simulation models. The MRMAide validation process extrapolates on existing processes that are implemented throughout the development cycle of a simulation model and addresses MRMAide's development processes.